Yeah, hubs can be left locked as much as you want, it will increase wear on your front driveline a little, but not noticeably. I leave my electric hubs locked for most of the winter.
Hello,
x2.
Cheap insurance.
Leving the hubs locked may also incrase your fuel mileage by one or two miles per gallon. But the ability to shift on the fly for increased traction is worth it.
Juan